Heating localized areas and then using a hammer and dolly to.
How to straighten sheet metal after welding.
It started as an art heat straightening began in the early days of welding with the earliest written information dating back to 1938.
When you weld after it cools there is always some shrinkage never expansion.
Heating to this temperature pushes the metal past the yield stress point and allows you to straighten the metal.
Heat straightening involves applying controlled heat to a deformed part of steel in heating and cooling cycles until the metal gradually straightens.
When performing hot mechanical straightening heat the metal to the yield stress point.
If it did pull in then cut a brace or jack it open to push the sides apart to where they should be.
Maybe even make the brace slightly big.
The yield stress point is defined as the stress at which a material begins to deform plastically.
Put simply an experienced practitioner can apply heat in specific areas to straighten load bearing steel whilst still in place without adversely affecting its natural properties.
Heat straightening does not symmetrically straighten the metal and is a gradual process.
Working with sheel metal.
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Then weld on the other plates that you have laid out in marker.
Fabricators straighten metal using many methods including heat straightening.